CN101365655A - Pasty materials drying method and/or apparatus - Google Patents

Pasty materials drying method and/or apparatus Download PDF

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Publication number
CN101365655A
CN101365655A CNA2006800337659A CN200680033765A CN101365655A CN 101365655 A CN101365655 A CN 101365655A CN A2006800337659 A CNA2006800337659 A CN A2006800337659A CN 200680033765 A CN200680033765 A CN 200680033765A CN 101365655 A CN101365655 A CN 101365655A
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CN
China
Prior art keywords
plaster material
temperature
moisture eliminator
drying stage
drying
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CNA2006800337659A
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Chinese (zh)
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CN101365655B (en
Inventor
帝沙·菲南多
迈克尔·罗伯特·克文科
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Horsley Industries Ltd
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FLO DRY ENGINEERING Ltd
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Publication of CN101365655A publication Critical patent/CN101365655A/en
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/126—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using drum filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B1/00—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids
    • F26B1/005—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids by means of disintegrating, e.g. crushing, shredding, milling the materials to be dried
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
    • F26B17/08—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces the belts being arranged in a sinuous or zig-zag path
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/10—Temperature; Pressure
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/18—Sludges, e.g. sewage, waste, industrial processes, cooling towers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/20—Sludge processing

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention comprises a method and apparatus for drying pasty materials. The pasty materials are subjected to a first drying stage (1) at a first temperature, and then subjecting the partially dried pasty material are subjected to a second drying stage (10) at a second temperature. The second temperature is lower than the first temperature. The invention also envisages a method of drying and sterilising a pasty material comprising the steps of subjecting the pasty material to a first heat sterilisation process (1) and then a second heat drying process (10). The invention also envisages a method of drying pasty materials wherein the pasty material is broken into pieces (55) and partially dried (56) to form a crust at least partially over each piece prior to further processing of the pasty material.

Description

Plaster material drying means and/or plaster material drying installation
Technical field
The present invention relates to the method for dry plaster material and/or the device of dry plaster material such as mud.Described mud can comprise containing to be handled or semisolid, body refuse and the mud of untreated sewage, or other biological waste material, or other contains the material of vaporizable liquid.Described vaporizable liquid is generally water, but does not also get rid of other liquid outside the water.
Background technology
Mud, as sewage sludge from city enterprise, for example, may comprise about 1%～5% solids content in these mud from industrial plant such as paper pulp and paper plant, food factory, refinery and waste treatment plant such as air-dissolving air-float system, anaerobic digestion, extended aeration and chemical mineral processing process etc.Usually these mud all will pass through the processed process, and for example mechanical filter, centrifuging or extruding is to make the mud of having removed free water basically.But the retention that makes like this has in the mud of basic combination water and still contains large quantity of moisture.The content of drying solid is about 12～30% in this mud.In order to make the transportable mud that is free from germs, the moisture content in the described mud need be reduced to below 10%.
Summary of the invention
Goal of the invention
Therefore the method and/or the device that the purpose of this invention is to provide a kind of dry plaster material, this method and/or device will be with simple but efficient manner satisfies the demand at least to a certain extent, and perhaps described method and/or device can be the public at least provides a useful selection.
Summary of the invention
Therefore, one aspect of the invention is the method for dry plaster material, this method may further comprise the steps: make plaster material under first temperature through first drying stage, then make this part exsiccant plaster material under second temperature through second drying stage, described second temperature is lower than described first temperature.
Preferably, described first drying stage is undertaken by the mode that reduces described plaster material caking as far as possible.
Preferably, described first drying stage carries out in rotatory drier, and this first drying stage finished before a large amount of cakings of mud take place.
Preferably, described rotatory drier is a rotating drum dryer.
Preferably, described second drying stage carries out on the type moisture eliminator that do not lump.
Preferably, described second drying stage carries out on moving bed dryer.
Preferably, described second temperature is elected as be lower than in drying process or the limits of explosion temperature of the described material in dry back.
Preferably, described first drying stage is heated at least 50 ℃ with the core temperature of described plaster material.
Preferably, described first drying stage is heated at least 100 ℃ with the core temperature of described plaster material.
Preferably, described first drying stage is heated at least 180 ℃ with the core temperature of described plaster material.
Preferably, described method further comprises the plaster material pulverising step that is between described first drying stage and second drying stage.
Preferably, described method further comprises the plaster material pulverising step that is in before described first drying stage.
Preferably, described method makes described plaster material be ground into particle and the dry described particulate step of part before further being included in described first drying stage.
Another aspect of the present invention is the drying and the method for disinfection of plaster material, may further comprise the steps: make described plaster material through the first step heat-sterilization process, then make it through the second step heat drying process.
Preferably, described sterilization process begins when plaster material is relatively moister.
Preferably, described moisture content is greater than 15wt% (weight percent).
Preferably, described moisture content is 70～88wt%.
Another aspect of the present invention is the device of dry plaster material, and this device comprises can be at first moisture eliminator of working under first temperature and second moisture eliminator of working under second temperature, and described second temperature is lower than described first temperature.
Preferably, described first moisture eliminator comprises one way or multipass moisture eliminator.
Preferably, described second moisture eliminator comprises one way or multipass moisture eliminator.
Preferably, described first moisture eliminator comprises rotatory drier.
Preferably, described rotatory drier comprises rotating drum dryer.
Preferably, described second moisture eliminator comprises moving bed dryer.
Preferably, described second temperature is lower than limits of explosion temperature to be dried or dried material on the moisture eliminator.
Preferably, described first moisture eliminator comprises well heater, and this well heater can make the core temperature of described plaster material rise at least 100 ℃.
Preferably, described first moisture eliminator comprises well heater, and this well heater can make the core temperature of described plaster material rise to about 180 ℃.
Preferably, described device further comprises the pulverizer between described first and second moisture eliminators.
Preferably, described device comprises another pulverizer that is positioned at before described first moisture eliminator.
Preferably, described device also comprises another pulverizer, and this pulverizer is positioned at before described first moisture eliminator, pulverize described plaster material.
Preferably, before described another pulverizer, be provided with predrying device, so that the dry described plaster material of small part.
Another aspect of the present invention is the method for dry plaster material, wherein before further handling described plaster material, earlier this plaster material is broken into particle and part drying, covers each particulate duricrust to be formed up to small part.
Any modification that those skilled in the art are done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection domain of the present invention.The disclosed content of this specification sheets is pure exemplary, should not constitute limiting the scope of the invention.
Description of drawings
Below with reference to accompanying drawing a preferred embodiment of the present invention is described, this accompanying drawing is the diagram according to the device that is used for dry plaster material of a preferred embodiment of the invention, and the method for having showed dry plaster material in accordance with a preferred embodiment of the present invention.
Embodiment
Referring to accompanying drawing, with plaster material, be the dewatered sludge of 20wt% as dry solids content, import in first moisture eliminator 1.If desired or necessary, can make described dewatered sludge before entering described first moisture eliminator earlier by first pulverizer 2.Usually this pulverizer 2 is ground into the particle of size range between 10～20mm with size greater than the material piece of 15mm.Basically, pulverizer 2 is pulverized described material and is offered described first moisture eliminator 1 with the particle that forms same particle size.As what select, pulverizer 2 can be a forcing machine.
Described first moisture eliminator can be one way or multipass moisture eliminator, and this first moisture eliminator can turn round under the first higher temperature, and its preferred form is rotatory drier, particularly rotating drum dryer.This first moisture eliminator comprises well heater 3, and this well heater 3 can heat described dewatered sludge, make its core temperature rise to preferably at least 50 ℃, more preferably 100 ℃, preferred more especially 180 ℃, thus by this heat-processed fast, degerm up hill and dale.
In a preferred implementation, described moisture eliminator 1 is a rotatory drier, preferred one way swing roller moisture eliminator, and this moisture eliminator can be worked under air/charge ratio (air/feed product ratio) is lower than the condition of conventional swing roller moisture eliminator.This moisture eliminator is provided with internal partition and push rod, and described cylinder installs with only angle of inclination, realizes in the mode that efficiency is arranged most to guarantee the drying process in the moisture eliminator, thereby makes further minimum heat losses in the waste gas.This moisture eliminator can be located to obtain the applicant, is referred to as " Flo-DryRotary Dryer ".
In described first moisture eliminator 1, it is 40～60wt% that described particle is dried to dry solids content, and therefore described material can not condense or be agglomerated into piece fully.The diameter of all pieces that form in described first moisture eliminator 1 usually can be greater than 20mm.Described first moisture eliminator 1 is by the energy supply of direct ignition burner, the fuel of this torch such as Sweet natural gas, LPG (liquefied petroleum gas (LPG)), oil siccative base liquid fuel (Petroleum Dryerbase liquid fuel), from the biogas of methane-generating pit, from the high-temp waste gas of generator or powder fuel burner, described powder fuel burner uses solid fuel and comprises the final drying sewage sludge that the present invention exports.
The input temp of described warm air and burning gas is preferably in 300～800 ℃, and this temperature is much higher than the temperature that adopts in the prior art moisture eliminator.This temperature has not only reduced the amount of used gas in the drying process, and can carry out sterilization to described mud, makes its requirement of satisfying USEPA 503 A standards or better.
In preferred implementation of the present invention, the material that enters the feed end 4 of described first moisture eliminator 1 is heated by hot gas, reach 50～180 ℃ (at least 100 ℃ of core temperatures soon, preferred about 180 ℃), keep the sufficiently long time of this temperature, this time is equivalent to the required time of conventional sterilization process (the conventional sterilization process need remain on final desciccate 80～90 ℃ of several minutes), and surpasses USDA, and the germ that E.U. and New Zealand environment department require lowers the requirement.
The high input temp that leads to described first moisture eliminator makes the very fast rising of core temperature of material.When core temperature was 100～180 ℃, the time of killing pathogenic bacteria only needed about several seconds fully.Allow the zooming reason of core temperature be just to carry out sterilisation step when process begins, the moisture content height in this moment mud is for example between 70～88%.This high moisture content can improve heat conducting thermal conduction characteristic---specific heat capacity, and the total heat of importing the material core into is heated described material, be heated to 180 ℃ in one embodiment, and can not damage organic thermolability of mud, also do not have the danger of blast.
At the feed end 4 of described first moisture eliminator 1, described high moisture content has fully prevented the formation of dust, and along with the heating to material, the overheated moisture that is used to evaporate in the mud of material.
In the prior art, the heat-sterilization structure is applied to the end of described process, and this moment, moisture content generally was lower than 15wt%, and can be low to moderate 10wt%.In the environment of this low moisture content, even be heated to 80 ℃ and will produce dust, and with the danger of blast.In first moisture eliminator 1, adopt high input temp to mean that the amount of the gas that uses in described first moisture eliminator 1 reduces greatly, this has reduced the absolute oxygen level in described first moisture eliminator 1, reduced the danger of blast again, because used gas reduces, therefore also reduced the size of described drying and relevant device such as pipeline, blower fan and heat exchanging apparatus etc. in addition.
The material that comes out from the exit end 5 of first moisture eliminator 1 enters another pulverizer 6, and this pulverizer 6 is crushed to particle diameter with any bulk pellet once more and is about 5～15mm.(for example 3～30rpm) turning axles are equipped with cutter or blade on this turning axle at a slow speed can be provided with one or two in the described pulverizer 6.For some mud, available forcing machine replaces pulverizer 6, and described forcing machine can produce identical material bar, and this material bar can be cut into the product of selecting length.Usually particle size in this case is the about 2～8mm of diameter, the about 5～20mm of length.
Therefore, the material particles that comes out from described pulverizer 6 roughly has identical size.
The material that comes out from pulverizer 6 enters second moisture eliminator 10, and this second moisture eliminator 10 can be one way or multipass moisture eliminator equally.Second moisture eliminator 10 is worked under than the low temperature of first moisture eliminator, and also is the moisture eliminator of type of not luming, and an exemplary of this moisture eliminator is a belt dryer.Available hot gas heats described belt dryer, and hot air temperature is between 30～150 ℃; Described second moisture eliminator, 10 sufficiently longs, so the dry solids content that the mud in its exit has can reach 90～95wt%.Temperature in second moisture eliminator is chosen enough low, to get rid of the dangerous of dust explosion or danger minimized.
In a preferred embodiment of the present invention, the contained heat of water and gas that steams that is used for the heat energy origin self-desiccation device 1 of second moisture eliminator 10 is supplied with, available heat exchanger system 11 concentrates and/or cools off described water and the gas of steaming, to provide temperature about 35～95 ℃ hot water.If desired, in the future self-desiccation device 1 described steams thermal exchange contained in water and the gas and gives air, to produce the required warm air of second moisture eliminator 10.Therefore, make the about 100 ℃ gas that comes out from pipeline 12 pass through heat exchanger 13, to provide hot water at 14 places, the temperature of this hot water for example is 80 ℃.The gas that heat exchanger 15 provides at 16 places for example is 70 ℃, and if necessary, gas heater 17 auxiliary or that replenish can be set, and to provide about 90 ℃ gas at 18 places, this gas is in 19 places input moisture eliminator 10.The material that comes out from second moisture eliminator 10 is cooled to about 40 ℃ cooling segment, it is inner or outside that this cooling segment is positioned at described second moisture eliminator 10.Can in gas heat exchanger 21, be used for cooling off described final dried material from atmospheric freezing air (temperature of this freezing air for example is 5～30 ℃).
The use of blower fan, condenser and heat pump makes heat to be saved.Induced draft fan (ID fan) 30 makes about 40～105 ℃ moisture of temperature of discharging from second moisture eliminator 10 can pass through gas/water condenser 31, at last, if desired, can in biofilter or any other smell treatment unit (32 places among the figure), handle, to remove the stink in the exhaust the gas of described quilt (condenser 31) cooling and dehumidifying.
Part from second moisture eliminator 10 in the expellant gas is heated in gas/water-to-water heat exchanger 15, and is used further in second moisture eliminator 10.Steam of discharging from moisture eliminator 1 and gas are by condenser 13, and this condenser 13 is gas/water-to-water heat exchanger, and the gas after the described dehumidifying is used as the input gas of first moisture eliminator 1.The gas converting heat device is used to heat recovery system 11 as described in the balance as heat pump 40 and 41, interchanger 42 and induced draft fan 43.Be admitted to biofilter (51 places among the figure) at 50 places from the final waste gas in first moisture eliminator 1.
More advantageously, the mud precrushing that will wet in pulverizer 55 earlier before the processed is the particle that granularity is about 25～50mm for some mud.
These particles then can preheating in well heater 56, and this well heater 56 can be the conveyor type moisture eliminator, and this moisture eliminator is used to the recovery heat from the downstream drying process.Other form of heating such as infrared, microwave or electric heating etc.Target is heating described precrushing particulate outside, makes it form duricrust, and preventing that mud is agglomerating or to make agglomerating minimizing, otherwise this agglomerate will appear in pulverizer 2 or the moisture eliminator 1.This makes the generation of dust minimize, and makes the dust content in the wet mud of input be low to moderate 1wt%.This pre-thermosetting cover the duricrust on the surface of each sludge granules to small part, preferably all cover.
Therefore, the invention provides the method and/or the device that are used for dry plaster material, at least in preferred implementation of the present invention, described method and/or device have advantage promptly can be with the dry plaster material of efficient mode, drop to minimum with the risk that reduces energy expenditure, plaster material is lumpd in drying process, thereby make curing requirements drop to minimum, especially, this also makes the danger of dust explosion drop to minimum.Described device is when maintenance efficient is high, and space efficiency and efficiency are also high.
Because the dry material of crossing does not need recirculation, so energy requirement reduces and do not need the circulating path of material that is dried, thereby " footprint " of described operating process shortened.
By using the heat of discharging from first drying stage, energy requirement can be dropped to minimum.Believe with existing system and compare that the present invention can reduce the consumption of heat energy and electric energy greatly.
The requirement that begins to provide high calorie input (to make product) to satisfy relevant criterion in described process.
Described process also can be produced granular, non-dusting substantially product.

Claims (35)

1. the method for dry plaster material, this method may further comprise the steps: make plaster material under first temperature through first drying stage, then make part exsiccant plaster material under second temperature through second drying stage, described second temperature is lower than described first temperature.
2. the described method of claim 1 is characterized in that: described first drying stage is undertaken by the mode that reduces described plaster material caking as far as possible.
3. claim 1 or 2 described methods, it is characterized in that: described first drying stage carries out in rotatory drier, and this first drying stage finished before the caking of mud takes place.
4. the described method of claim 3, it is characterized in that: described rotatory drier is a rotating drum dryer.
5. according to the described method of aforementioned each claim, it is characterized in that: described second drying stage is undertaken by the type moisture eliminator that do not lump.
6. the described method of claim 5, it is characterized in that: described second drying stage is undertaken by moving bed dryer.
7. according to the described method of aforementioned each claim, it is characterized in that: described second temperature choosing is lower than in drying process or the limits of explosion temperature of dry back described material.
8. according to the described method of aforementioned each claim, it is characterized in that: described first drying stage is heated at least 50 ℃ with the core temperature of described plaster material.
9. the described method of claim 8, it is characterized in that: described first drying stage is heated at least 100 ℃ with the core temperature of described plaster material.
10. the described method of claim 9, it is characterized in that: described first drying stage is heated to about 180 ℃ with the core temperature of described plaster material.
11. according to the described method of aforementioned each claim, it is characterized in that: described method further comprises the plaster material pulverising step that is between described first drying stage and second drying stage.
12. according to the described method of aforementioned each claim, it is characterized in that: described method further comprises the plaster material pulverising step that is in before described first drying stage.
13. according to the described method of aforementioned each claim, it is characterized in that: described method makes described plaster material be ground into particle and the dry described particulate step of part before further being included in described first drying stage.
14. the drying of plaster material and method for disinfection may further comprise the steps: make described plaster material through the first step heat-sterilization process, then make it through the second step heat drying process.
15. the described method of claim 14 is characterized in that: described sterilization process begins when plaster material is relatively moister.
16. the described method of claim 15 is characterized in that: described moisture content is greater than 15wt%.
17. the described method of claim 16 is characterized in that: described moisture content is 70～88wt%.
18. be used for the device of dry plaster material, this device comprises can be at first moisture eliminator of working under first temperature and second moisture eliminator of working under second temperature, described second temperature is lower than described first temperature.
19. the described device of claim 18 is characterized in that: described first moisture eliminator comprises one way or multipass moisture eliminator.
20. claim 18 or 19 described devices is characterized in that: described second moisture eliminator comprises one way or multipass moisture eliminator.
21. each described device in the claim 18～20 is characterized in that: described first moisture eliminator comprises rotatory drier.
22. each described device in the claim 18～21, it is characterized in that: described rotatory drier comprises rotating drum dryer.
23. each described device in the claim 18～22 is characterized in that: described second moisture eliminator comprises moving bed dryer.
24. each described device in the claim 18～23 is characterized in that: described second temperature is lower than limits of explosion temperature to be dried or dried material on the moisture eliminator.
25. each described device in the claim 18～24 is characterized in that: described first moisture eliminator comprises well heater, this well heater can make the core temperature of described plaster material rise at least 100 ℃.
26. each described device in the claim 18～25 is characterized in that: described first moisture eliminator comprises well heater, this well heater can make the core temperature of described plaster material rise to about 180 ℃.
27. each described device in the claim 18～26 is characterized in that: described device further comprises the pulverizer between described first and second moisture eliminators.
28. each described device in the claim 18～27 is characterized in that: described device comprises another pulverizer that is positioned at before described first moisture eliminator.
29. the described device of claim 28 is characterized in that: described device also comprises another pulverizer of pulverizing described plaster material, and this pulverizer is positioned at before described first moisture eliminator.
30. claim 28 or 29 described devices is characterized in that: before described another pulverizer, be provided with to the predrying device of the dry described plaster material of small part.
31. the method for dry plaster material is characterized in that: before further handling described plaster material, earlier this plaster material is ground into particle and part drying, covers each particulate duricrust to be formed up to small part.
32. the described method of claim 1 is characterized in that: this method is as described in about the description of accompanying drawing.
33. the described method of claim 14 is characterized in that: this method is as described in about the description of accompanying drawing.
34. the described device of claim 18 is characterized in that: this device is as described in about the description of accompanying drawing.
35. the described method of claim 31 is characterized in that: this method is as described in about the description of accompanying drawing.
CN2006800337659A 2005-07-25 2006-07-24 Pasty materials drying method and/or apparatus Expired - Fee Related CN101365655B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NZ541426 2005-07-25
NZ541426A NZ541426A (en) 2005-07-25 2005-07-25 Method and apparatus for drying
PCT/NZ2006/000187 WO2007013819A1 (en) 2005-07-25 2006-07-24 Improvements in/or relating to a method of drying pasty materials and/or apparatus for drying pasty materials

Publications (2)

Publication Number Publication Date
CN101365655A true CN101365655A (en) 2009-02-11
CN101365655B CN101365655B (en) 2012-09-05

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CN102913912A (en) * 2011-08-05 2013-02-06 广州市醇美环境污染防治专用设备科技有限公司 Domestic garbage crushing and drying treatment technology
TWI622433B (en) * 2014-11-14 2018-05-01 比爾與梅琳達蓋茲財團法人 Multi-functional fecal waste and garbage processor and associated methods
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US11885243B2 (en) 2014-11-14 2024-01-30 Bill & Melinda Gates Foundation Multi-functional fecal waste and garbage processor and associated methods
EP4365527A1 (en) * 2022-11-02 2024-05-08 Gyptech AB Heat recuperation in gypsuym board drying process
WO2024094555A1 (en) * 2022-11-02 2024-05-10 Gyptech Ab Heat recuperation in gypsum board drying process

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AU2006272968B2 (en) 2011-07-14
EP1907328B1 (en) 2015-10-07
WO2007013819A1 (en) 2007-02-01
NZ541426A (en) 2008-06-30
CA2616812A1 (en) 2007-02-01
AU2006272968A1 (en) 2007-02-01
KR20080064111A (en) 2008-07-08
US20080216346A1 (en) 2008-09-11
EP1907328A1 (en) 2008-04-09
CN101365655B (en) 2012-09-05

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